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Hersteller: Hitachi Dateigröße: 1.02 mb Dateiname: 307830F.pdf Unterrichtssprache:

A black color on the commutator is normal. Have the commutator resurfaced by a qualified motor repair shop if the brushes seem to wear too fast. 5. Install the new brush (C) so its lead is in the long slot (H) of the holder. See Fig. 13. Slide the terminal (E) under the terminal screw washer. Make sure the motor lead (G) is still connected the at the screw. Tighten the screw (F). See Fig. 12. 6. Place the spring (B) on the brush as shown in Fig. 13. The spring must coil as shown. 7. Push in and hook the spring clip (D). See Fig. 13. 8. Repeat for the other side. 9. Test the brushes. Remove the connecting rod pin (50). See 15, page 14. With the sprayer off, turn the pressure control knob fully counterclockwise to minimum pressure. Plug in the sprayer. Turn the sprayer on. Slowly increase the pressure until the motor is at full speed. Inspect the brush and commutator contact area for excessive arcing. Arcs should not “trail” or circle around the commutator surface. CAUTION Do not touch the brushes, leads, springs or brush holders while the sprayer is plugged in, to reduce the risk of electric shock and serious bodily injury. 10. Install the brush inspection plates, gaskets and covers. 11. Break in the brushes. Operate the sprayer for at least one hour with no load. Then reinstall the connecting rod pin (50). Fig. 11 B C D Order part no. 110–816 Hook of spring clip Fig. 12 B C D E F G 10 mm minimum Fig. 13 H B C D Spring must coil in this direction Displacement Pump 222 4 49 223 6 50 51 A Torque to 80 ft–lb (107 N.m) 3 52 32 76 75 74 Repairing the pump See manual 307–806 for pump repair instructions. Reinstalling the pump See Fig. 14 and 15. 1. Rotate the crankshaft (A) so the connecting rod is in its lowest position. 2. The pump piston rod (223) should protrude about 1 in. (25 mm) above the pump cylinder. 3. Screw the pump into the bearing housing (51) until its pin hole is aligned with the connecting rod (52) pin hole. Insert the pin (50). Position the spring 30 (49) so it covers the ends of the pin. See Fig. 15. WARNING 01746B Fig. 14 WARNING INJECTION HAZARD To reduce the risk of serious bodily injury, follow the Pressure Relief Procedure Warning on page 11 before check ing or repairing any part of the spray system. Removing the pump See Fig. 14. 1. Flush the sprayer. Relieve pressure. 2. Remove the clips (74,76) and drain hose (75). 3. Hold the intake valve (222) steady with a wrench and unscrew the suction tube (3). 4. Use a screwdriver to push the retaining spring (49) up, and then push out the pin (50). 5. Loosen the locknut (6). Unscrew the pump (4). Be sure the retaining spring (49) is firmly and completely in the groove of the connecting rod to prevent the pin (50) from working loose due to vibration. If the pin works loose, it or other parts could break off due to the force of the pumping action, resulting in serious bodily injury, pump or property damage. 4. Adjust the pump so the cylinder’s top threads are flush with the face (B) of the bearing housing and the outlet nipple (32) is straight back. See Fig. 15. 5. Torque the locknut (6) to 80 ft-lb (107 N.m). 6. Reassemble the remaining parts, in the reverse order of removal. 49 50 B 32 52 51 01751A Fig. 15 . . Connecting Rod and Bearing Housing WARNING INJECTION HAZARD To reduce the risk of serious bodily injury, follow the Pressure Relief Procedure Warning on page 11 before check ing or repairing any part of the spray system. NOTE: Refer to Fig. 16. 1. Remove the pail hanger (7). 2. Remove the front cover (12). 3. Remove the pump as described on page 14. 4. Remove the four screws (9) and lockwashers (10). Pull the bearing housing (51) and connecting rod assembly (52) off the crankshaft (C). 5. Clean and inspect the crankshaft (C). Wipe it clean with a rag (don’t use solvent). If the crankshaft is badly worn, replace the drive assembly (14). See page 21. 6. Clean and inspect the bearing housing (51) and connecting rod (52), including the needle bearing (A). Replace both parts if either is worn or damaged. See Detail A. 7. Clean the mating surfaces of the bearing and drive housings. CAUTION To extend the service life of the connecting rod bearing, lubricate it properly. After every 100 hours of operation, or whenever servicing the pump (whichever comes first), fill the cavity (B) in the connecting rod with SAE non-detergent motor oil. See Detail A. 8. Coat the surfaces of the connecting rod and bearing with SAE non-detergent motor oil. Liberally pack the needle bearing (A) with industrial grade, heavy duty, extreme pressure, lithium soap grease. See Detail A. 9. Assemble the connecting rod (52) and bearing housing (51). 10. Align the connecting rod (52) with the crank (C) and push the bearing housing (51) onto the drive housing (14). 11. Assemble the remaining parts. Refer to page 14 to reinstall the pump. Detail A 01750BFig. 16 30 32 C 9 10 52 51 12 49 7 50 6 A 14 B 13 5 . . Drive Housing WARNING INJECTION HAZARD To reduce the risk o...

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